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Date:: Mon Sep 26 11:46:21 2005 UTC
Message:: More thread names.
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1 #include <u.h>
2 #include <libc.h>
3 #include <draw.h>
4 #include <thread.h>
5 #include <cursor.h>
6 #include <mouse.h>
7 #include <keyboard.h>
8 #include <frame.h>
9 #include <fcall.h>
10 #include <plumb.h>
11 #include "dat.h"
12 #include "fns.h"
13 	/* for generating syms in mkfile only: */
14 	#include <bio.h>
15 	#include "edit.h"
16 
17 void	mousethread(void*);
18 void	keyboardthread(void*);
19 void	waitthread(void*);
20 void	xfidallocthread(void*);
21 void	newwindowthread(void*);
22 void plumbproc(void*);
23 
24 Reffont	**fontcache;
25 int		nfontcache;
26 char		wdir[512] = ".";
27 Reffont	*reffonts[2];
28 int		snarffd = -1;
29 int		mainpid;
30 int		swapscrollbuttons = FALSE;
31 
32 enum{
33 	NSnarf = 1000	/* less than 1024, I/O buffer size */
34 };
35 Rune	snarfrune[NSnarf+1];
36 
37 char		*fontnames[2] =
38 {
39 	"/lib/font/bit/lucidasans/euro.8.font",
40 	"/lib/font/bit/lucm/unicode.9.font",
41 };
42 
43 Command *command;
44 
45 void	shutdownthread(void*);
46 void	acmeerrorinit(void);
47 void	readfile(Column*, char*);
48 static int	shutdown(void*, char*);
49 
50 void
51 derror(Display *d, char *errorstr)
52 {
53 	USED(d);
54 	error(errorstr);
55 }
56 
57 void
58 threadmain(int argc, char *argv[])
59 {
60 	int i;
61 	char *p, *loadfile;
62 	Column *c;
63 	int ncol;
64 	Display *d;
65 
66 	rfork(RFENVG|RFNAMEG);
67 
68 	ncol = -1;
69 
70 	loadfile = nil;
71 	ARGBEGIN{
72 	case '$':
73 		dodollarsigns = TRUE;
74 		break;
75 	case 'D':
76 		{extern int _threaddebuglevel;
77 		_threaddebuglevel = ~0;
78 		}
79 		break;
80 	case 'a':
81 		globalautoindent = TRUE;
82 		break;
83 	case 'b':
84 		bartflag = TRUE;
85 		break;
86 	case 'c':
87 		p = ARGF();
88 		if(p == nil)
89 			goto Usage;
90 		ncol = atoi(p);
91 		if(ncol <= 0)
92 			goto Usage;
93 		break;
94 	case 'f':
95 		fontnames[0] = ARGF();
96 		if(fontnames[0] == nil)
97 			goto Usage;
98 		break;
99 	case 'F':
100 		fontnames[1] = ARGF();
101 		if(fontnames[1] == nil)
102 			goto Usage;
103 		break;
104 	case 'l':
105 		loadfile = ARGF();
106 		if(loadfile == nil)
107 			goto Usage;
108 		break;
109 	case 'r':
110 		swapscrollbuttons = TRUE;
111 		break;
112 	case 'W':
113 		winsize = ARGF();
114 		if(winsize == nil)
115 			goto Usage;
116 		break;
117 	default:
118 	Usage:
119 		fprint(2, "usage: acme -a -c ncol -f fontname -F fixedwidthfontname -l loadfile -W winsize\n");
120 		threadexitsall("usage");
121 	}ARGEND
122 
123 	fontnames[0] = estrdup(fontnames[0]);
124 	fontnames[1] = estrdup(fontnames[1]);
125 
126 	quotefmtinstall();
127 	cputype = getenv("cputype");
128 	objtype = getenv("objtype");
129 	home = getenv("HOME");
130 	p = getenv("tabstop");
131 	if(p != nil){
132 		maxtab = strtoul(p, nil, 0);
133 		free(p);
134 	}
135 	if(maxtab == 0)
136 		maxtab = 4; 
137 	if(loadfile)
138 		rowloadfonts(loadfile);
139 	putenv("font", fontnames[0]);
140 	snarffd = open("/dev/snarf", OREAD|OCEXEC);
141 /*
142 	if(cputype){
143 		sprint(buf, "/acme/bin/%s", cputype);
144 		bind(buf, "/bin", MBEFORE);
145 	}
146 	bind("/acme/bin", "/bin", MBEFORE);
147 */
148 	getwd(wdir, sizeof wdir);
149 
150 /*
151 	if(geninitdraw(nil, derror, fontnames[0], "acme", nil, Refnone) < 0){
152 		fprint(2, "acme: can't open display: %r\n");
153 		threadexitsall("geninitdraw");
154 	}
155 */
156 	if(initdraw(derror, fontnames[0], "acme") < 0){
157 		fprint(2, "acme: can't open display: %r\n");
158 		threadexitsall("initdraw");
159 	}
160 
161 	d = display;
162 	font = d->defaultfont;
163 //assert(font);
164 
165 	reffont.f = font;
166 	reffonts[0] = &reffont;
167 	incref(&reffont.ref);	/* one to hold up 'font' variable */
168 	incref(&reffont.ref);	/* one to hold up reffonts[0] */
169 	fontcache = emalloc(sizeof(Reffont*));
170 	nfontcache = 1;
171 	fontcache[0] = &reffont;
172 
173 	iconinit();
174 	timerinit();
175 	rxinit();
176 
177 	cwait = threadwaitchan();
178 	ccommand = chancreate(sizeof(Command**), 0);
179 	chansetname(ccommand, "ccommand");
180 	ckill = chancreate(sizeof(Rune*), 0);
181 	chansetname(ckill, "ckill");
182 	cxfidalloc = chancreate(sizeof(Xfid*), 0);
183 	chansetname(cxfidalloc, "cxfidalloc");
184 	cxfidfree = chancreate(sizeof(Xfid*), 0);
185 	chansetname(cxfidfree, "cxfidfree");
186 	cnewwindow = chancreate(sizeof(Channel*), 0);
187 	chansetname(cnewwindow, "cnewwindow");
188 	cerr = chancreate(sizeof(char*), 0);
189 	chansetname(cerr, "cerr");
190 	cedit = chancreate(sizeof(int), 0);
191 	chansetname(cedit, "cedit");
192 	cexit = chancreate(sizeof(int), 0);
193 	chansetname(cexit, "cexit");
194 	cwarn = chancreate(sizeof(void*), 1);
195 	chansetname(cwarn, "cwarn");
196 	if(cwait==nil || ccommand==nil || ckill==nil || cxfidalloc==nil || cxfidfree==nil || cerr==nil || cexit==nil || cwarn==nil){
197 		fprint(2, "acme: can't create initial channels: %r\n");
198 		threadexitsall("channels");
199 	}
200 
201 	mousectl = initmouse(nil, screen);
202 	if(mousectl == nil){
203 		fprint(2, "acme: can't initialize mouse: %r\n");
204 		threadexitsall("mouse");
205 	}
206 	mouse = &mousectl->m;
207 	keyboardctl = initkeyboard(nil);
208 	if(keyboardctl == nil){
209 		fprint(2, "acme: can't initialize keyboard: %r\n");
210 		threadexitsall("keyboard");
211 	}
212 	mainpid = getpid();
213 	startplumbing();
214 /*
215 	plumbeditfd = plumbopen("edit", OREAD|OCEXEC);
216 	if(plumbeditfd < 0)
217 		fprint(2, "acme: can't initialize plumber: %r\n");
218 	else{
219 		cplumb = chancreate(sizeof(Plumbmsg*), 0);
220 		threadcreate(plumbproc, nil, STACK);
221 	}
222 	plumbsendfd = plumbopen("send", OWRITE|OCEXEC);
223 */
224 
225 	fsysinit();
226 
227 	#define	WPERCOL	8
228 	disk = diskinit();
229 	if(!loadfile || !rowload(&row, loadfile, TRUE)){
230 		rowinit(&row, screen->clipr);
231 		if(ncol < 0){
232 			if(argc == 0)
233 				ncol = 2;
234 			else{
235 				ncol = (argc+(WPERCOL-1))/WPERCOL;
236 				if(ncol < 2)
237 					ncol = 2;
238 			}
239 		}
240 		if(ncol == 0)
241 			ncol = 2;
242 		for(i=0; i<ncol; i++){
243 			c = rowadd(&row, nil, -1);
244 			if(c==nil && i==0)
245 				error("initializing columns");
246 		}
247 		c = row.col[row.ncol-1];
248 		if(argc == 0)
249 			readfile(c, wdir);
250 		else
251 			for(i=0; i<argc; i++){
252 				p = utfrrune(argv[i], '/');
253 				if((p!=nil && strcmp(p, "/guide")==0) || i/WPERCOL>=row.ncol)
254 					readfile(c, argv[i]);
255 				else
256 					readfile(row.col[i/WPERCOL], argv[i]);
257 			}
258 	}
259 	flushimage(display, 1);
260 
261 	acmeerrorinit();
262 	threadcreate(keyboardthread, nil, STACK);
263 	threadcreate(mousethread, nil, STACK);
264 	threadcreate(waitthread, nil, STACK);
265 	threadcreate(xfidallocthread, nil, STACK);
266 	threadcreate(newwindowthread, nil, STACK);
267 /*	threadcreate(shutdownthread, nil, STACK); */
268 	threadnotify(shutdown, 1);
269 	recvul(cexit);
270 	killprocs();
271 	threadexitsall(nil);
272 }
273 
274 void
275 readfile(Column *c, char *s)
276 {
277 	Window *w;
278 	Rune rb[256];
279 	int nb, nr;
280 	Runestr rs;
281 
282 	w = coladd(c, nil, nil, -1);
283 	cvttorunes(s, strlen(s), rb, &nb, &nr, nil);
284 	rs = cleanrname(runestr(rb, nr));
285 	winsetname(w, rs.r, rs.nr);
286 	textload(&w->body, 0, s, 1);
287 	w->body.file->mod = FALSE;
288 	w->dirty = FALSE;
289 	winsettag(w);
290 	textscrdraw(&w->body);
291 	textsetselect(&w->tag, w->tag.file->b.nc, w->tag.file->b.nc);
292 }
293 
294 char *ignotes[] = {
295 	"sys: write on closed pipe",
296 	"sys: ttin",
297 	"sys: ttou",
298 	"sys: tstp",
299 	nil
300 };
301 
302 char *oknotes[] ={
303 	"delete",
304 	"hangup",
305 	"kill",
306 	"exit",
307 	nil
308 };
309 
310 int	dumping;
311 
312 static int
313 shutdown(void *v, char *msg)
314 {
315 	int i;
316 
317 	USED(v);
318 
319 	for(i=0; ignotes[i]; i++)
320 		if(strncmp(ignotes[i], msg, strlen(ignotes[i])) == 0)
321 			return 1;
322 	
323 	killprocs();
324 	if(!dumping && strcmp(msg, "kill")!=0 && strcmp(msg, "exit")!=0 && getpid()==mainpid){
325 		dumping = TRUE;
326 		rowdump(&row, nil);
327 	}
328 	for(i=0; oknotes[i]; i++)
329 		if(strncmp(oknotes[i], msg, strlen(oknotes[i])) == 0)
330 			threadexitsall(msg);
331 	print("acme: %s\n", msg);
332 	return 0;
333 }
334 
335 /*
336 void
337 shutdownthread(void *v)
338 {
339 	char *msg;
340 	Channel *c;
341 
342 	USED(v);
343 
344 	threadsetname("shutdown");
345 	c = threadnotechan();
346 	while((msg = recvp(c)) != nil)
347 		shutdown(nil, msg);
348 }
349 */
350 
351 void
352 killprocs(void)
353 {
354 	Command *c;
355 
356 	fsysclose();
357 //	if(display)
358 //		flushimage(display, 1);
359 
360 	for(c=command; c; c=c->next)
361 		postnote(PNGROUP, c->pid, "hangup");
362 }
363 
364 static int errorfd;
365 int erroutfd;
366 
367 void
368 acmeerrorproc(void *v)
369 {
370 	char *buf;
371 	int n;
372 
373 	USED(v);
374 	threadsetname("acmeerrorproc");
375 	buf = emalloc(8192+1);
376 	while((n=read(errorfd, buf, 8192)) >= 0){
377 		buf[n] = '\0';
378 		sendp(cerr, estrdup(buf));
379 	}
380 }
381 
382 void
383 acmeerrorinit(void)
384 {
385 	int pfd[2];
386 
387 	if(pipe(pfd) < 0)
388 		error("can't create pipe");
389 #if 0
390 	sprint(acmeerrorfile, "/srv/acme.%s.%d", getuser(), mainpid);
391 	fd = create(acmeerrorfile, OWRITE, 0666);
392 	if(fd < 0){
393 		remove(acmeerrorfile);
394   		fd = create(acmeerrorfile, OWRITE, 0666);
395 		if(fd < 0)
396 			error("can't create acmeerror file");
397 	}
398 	sprint(buf, "%d", pfd[0]);
399 	write(fd, buf, strlen(buf));
400 	close(fd);
401 	/* reopen pfd[1] close on exec */
402 	sprint(buf, "/fd/%d", pfd[1]);
403 	errorfd = open(buf, OREAD|OCEXEC);
404 #endif
405 	fcntl(pfd[0], F_SETFD, FD_CLOEXEC);
406 	fcntl(pfd[1], F_SETFD, FD_CLOEXEC);
407 	erroutfd = pfd[0];
408 	errorfd = pfd[1];
409 	if(errorfd < 0)
410 		error("can't re-open acmeerror file");
411 	proccreate(acmeerrorproc, nil, STACK);
412 }
413 
414 /*
415 void
416 plumbproc(void *v)
417 {
418 	Plumbmsg *m;
419 
420 	USED(v);
421 	threadsetname("plumbproc");
422 	for(;;){
423 		m = threadplumbrecv(plumbeditfd);
424 		if(m == nil)
425 			threadexits(nil);
426 		sendp(cplumb, m);
427 	}
428 }
429 */
430 
431 void
432 keyboardthread(void *v)
433 {
434 	Rune r;
435 	Timer *timer;
436 	Text *t;
437 	enum { KTimer, KKey, NKALT };
438 	static Alt alts[NKALT+1];
439 
440 	USED(v);
441 	alts[KTimer].c = nil;
442 	alts[KTimer].v = nil;
443 	alts[KTimer].op = CHANNOP;
444 	alts[KKey].c = keyboardctl->c;
445 	alts[KKey].v = &r;
446 	alts[KKey].op = CHANRCV;
447 	alts[NKALT].op = CHANEND;
448 
449 	timer = nil;
450 	typetext = nil;
451 	threadsetname("keyboardthread");
452 	for(;;){
453 		switch(alt(alts)){
454 		case KTimer:
455 			timerstop(timer);
456 			t = typetext;
457 			if(t!=nil && t->what==Tag){
458 				winlock(t->w, 'K');
459 				wincommit(t->w, t);
460 				winunlock(t->w);
461 				flushimage(display, 1);
462 			}
463 			alts[KTimer].c = nil;
464 			alts[KTimer].op = CHANNOP;
465 			break;
466 		case KKey:
467 		casekeyboard:
468 			typetext = rowtype(&row, r, mouse->xy);
469 			t = typetext;
470 			if(t!=nil && t->col!=nil && !(r==Kdown || r==Kleft || r==Kright))	/* scrolling doesn't change activecol */
471 				activecol = t->col;
472 			if(t!=nil && t->w!=nil)
473 				t->w->body.file->curtext = &t->w->body;
474 			if(timer != nil)
475 				timercancel(timer);
476 			if(t!=nil && t->what==Tag) {
477 				timer = timerstart(500);
478 				alts[KTimer].c = timer->c;
479 				alts[KTimer].op = CHANRCV;
480 			}else{
481 				timer = nil;
482 				alts[KTimer].c = nil;
483 				alts[KTimer].op = CHANNOP;
484 			}
485 			if(nbrecv(keyboardctl->c, &r) > 0)
486 				goto casekeyboard;
487 			flushimage(display, 1);
488 			break;
489 		}
490 	}
491 }
492 
493 void
494 mousethread(void *v)
495 {
496 	Text *t, *argt;
497 	int but;
498 	uint q0, q1;
499 	Window *w;
500 	Plumbmsg *pm;
501 	Mouse m;
502 	char *act;
503 	enum { MResize, MMouse, MPlumb, MWarnings, NMALT };
504 	static Alt alts[NMALT+1];
505 
506 	USED(v);
507 	threadsetname("mousethread");
508 	alts[MResize].c = mousectl->resizec;
509 	alts[MResize].v = nil;
510 	alts[MResize].op = CHANRCV;
511 	alts[MMouse].c = mousectl->c;
512 	alts[MMouse].v = &mousectl->m;
513 	alts[MMouse].op = CHANRCV;
514 	alts[MPlumb].c = cplumb;
515 	alts[MPlumb].v = &pm;
516 	alts[MPlumb].op = CHANRCV;
517 	alts[MWarnings].c = cwarn;
518 	alts[MWarnings].v = nil;
519 	alts[MWarnings].op = CHANRCV;
520 	if(cplumb == nil)
521 		alts[MPlumb].op = CHANNOP;
522 	alts[NMALT].op = CHANEND;
523 	
524 	for(;;){
525 		qlock(&row.lk);
526 		flushwarnings();
527 		qunlock(&row.lk);
528 		flushimage(display, 1);
529 		switch(alt(alts)){
530 		case MResize:
531 			if(getwindow(display, Refnone) < 0)
532 				error("attach to window");
533 			draw(screen, screen->r, display->white, nil, ZP);
534 			scrlresize();
535 			rowresize(&row, screen->clipr);
536 			break;
537 		case MPlumb:
538 			if(strcmp(pm->type, "text") == 0){
539 				act = plumblookup(pm->attr, "action");
540 				if(act==nil || strcmp(act, "showfile")==0)
541 					plumblook(pm);
542 				else if(strcmp(act, "showdata")==0)
543 					plumbshow(pm);
544 			}
545 			plumbfree(pm);
546 			break;
547 		case MWarnings:
548 			break;
549 		case MMouse:
550 			/*
551 			 * Make a copy so decisions are consistent; mousectl changes
552 			 * underfoot.  Can't just receive into m because this introduces
553 			 * another race; see /sys/src/libdraw/mouse.c.
554 			 */
555 			m = mousectl->m;
556 			qlock(&row.lk);
557 			t = rowwhich(&row, m.xy);
558 			if(t!=mousetext && mousetext!=nil && mousetext->w!=nil){
559 				winlock(mousetext->w, 'M');
560 				mousetext->eq0 = ~0;
561 				wincommit(mousetext->w, mousetext);
562 				winunlock(mousetext->w);
563 			}
564 			mousetext = t;
565 			if(t == nil)
566 				goto Continue;
567 			w = t->w;
568 			if(t==nil || m.buttons==0)
569 				goto Continue;
570 			but = 0;
571 			if(m.buttons == 1)
572 				but = 1;
573 			else if(m.buttons == 2)
574 				but = 2;
575 			else if(m.buttons == 4)
576 				but = 3;
577 			barttext = t;
578 			if(t->what==Body && ptinrect(m.xy, t->scrollr)){
579 				if(but){
580 					if(swapscrollbuttons){
581 						if(but == 1)
582 							but = 3;
583 						else if(but == 3)
584 							but = 1;
585 					}
586 					winlock(w, 'M');
587 					t->eq0 = ~0;
588 					textscroll(t, but);
589 					winunlock(w);
590 				}
591 				goto Continue;
592 			}
593 			/* scroll buttons, wheels, etc. */
594 			if(t->what==Body && w != nil && (m.buttons & (8|16))){
595 				if(m.buttons & 8)
596 					but = Kscrolloneup;
597 				else
598 					but = Kscrollonedown;
599 				winlock(w, 'M');
600 				t->eq0 = ~0;
601 				texttype(t, but);
602 				winunlock(w);
603 				goto Continue;
604 			}
605 			if(ptinrect(m.xy, t->scrollr)){
606 				if(but){
607 					if(t->what == Columntag)
608 						rowdragcol(&row, t->col, but);
609 					else if(t->what == Tag){
610 						coldragwin(t->col, t->w, but);
611 						if(t->w)
612 							barttext = &t->w->body;
613 					}
614 					if(t->col)
615 						activecol = t->col;
616 				}
617 				goto Continue;
618 			}
619 			if(m.buttons){
620 				if(w)
621 					winlock(w, 'M');
622 				t->eq0 = ~0;
623 				if(w)
624 					wincommit(w, t);
625 				else
626 					textcommit(t, TRUE);
627 				if(m.buttons & 1){
628 					textselect(t);
629 					if(w)
630 						winsettag(w);
631 					argtext = t;
632 					seltext = t;
633 					if(t->col)
634 						activecol = t->col;	/* button 1 only */
635 					if(t->w!=nil && t==&t->w->body)
636 						activewin = t->w;
637 				}else if(m.buttons & 2){
638 					if(textselect2(t, &q0, &q1, &argt))
639 						execute(t, q0, q1, FALSE, argt);
640 				}else if(m.buttons & 4){
641 					if(textselect3(t, &q0, &q1))
642 						look3(t, q0, q1, FALSE);
643 				}
644 				if(w)
645 					winunlock(w);
646 				goto Continue;
647 			}
648     Continue:
649 			qunlock(&row.lk);
650 			break;
651 		}
652 	}
653 }
654 
655 /*
656  * There is a race between process exiting and our finding out it was ever created.
657  * This structure keeps a list of processes that have exited we haven't heard of.
658  */
659 typedef struct Pid Pid;
660 struct Pid
661 {
662 	int	pid;
663 	char	msg[ERRMAX];
664 	Pid	*next;
665 };
666 
667 void
668 waitthread(void *v)
669 {
670 	Waitmsg *w;
671 	Command *c, *lc;
672 	uint pid;
673 	int found, ncmd;
674 	Rune *cmd;
675 	char *err;
676 	Text *t;
677 	Pid *pids, *p, *lastp;
678 	enum { WErr, WKill, WWait, WCmd, NWALT };
679 	Alt alts[NWALT+1];
680 
681 	USED(v);
682 	threadsetname("waitthread");
683 	pids = nil;
684 	alts[WErr].c = cerr;
685 	alts[WErr].v = &err;
686 	alts[WErr].op = CHANRCV;
687 	alts[WKill].c = ckill;
688 	alts[WKill].v = &cmd;
689 	alts[WKill].op = CHANRCV;
690 	alts[WWait].c = cwait;
691 	alts[WWait].v = &w;
692 	alts[WWait].op = CHANRCV;
693 	alts[WCmd].c = ccommand;
694 	alts[WCmd].v = &c;
695 	alts[WCmd].op = CHANRCV;
696 	alts[NWALT].op = CHANEND;
697 
698 	command = nil;
699 	for(;;){
700 		switch(alt(alts)){
701 		case WErr:
702 			qlock(&row.lk);
703 			warning(nil, "%s", err);
704 			free(err);
705 			flushimage(display, 1);
706 			qunlock(&row.lk);
707 			break;
708 		case WKill:
709 			found = FALSE;
710 			ncmd = runestrlen(cmd);
711 			for(c=command; c; c=c->next){
712 				/* -1 for blank */
713 				if(runeeq(c->name, c->nname-1, cmd, ncmd) == TRUE){
714 					if(postnote(PNGROUP, c->pid, "kill") < 0)
715 						warning(nil, "kill %S: %r\n", cmd);
716 					found = TRUE;
717 				}
718 			}
719 			if(!found)
720 				warning(nil, "Kill: no process %S\n", cmd);
721 			free(cmd);
722 			break;
723 		case WWait:
724 			pid = w->pid;
725 			lc = nil;
726 			for(c=command; c; c=c->next){
727 				if(c->pid == pid){
728 					if(lc)
729 						lc->next = c->next;
730 					else
731 						command = c->next;
732 					break;
733 				}
734 				lc = c;
735 			}
736 			qlock(&row.lk);
737 			t = &row.tag;
738 			textcommit(t, TRUE);
739 			if(c == nil){
740 				/* helper processes use this exit status */
741 				if(strncmp(w->msg, "libthread", 9) != 0){
742 					p = emalloc(sizeof(Pid));
743 					p->pid = pid;
744 					strncpy(p->msg, w->msg, sizeof(p->msg));
745 					p->next = pids;
746 					pids = p;
747 				}
748 			}else{
749 				if(search(t, c->name, c->nname)){
750 					textdelete(t, t->q0, t->q1, TRUE);
751 					textsetselect(t, 0, 0);
752 				}
753 				if(w->msg[0])
754 					warning(c->md, "%.*S: exit %s\n", c->nname-1, c->name, w->msg);
755 				flushimage(display, 1);
756 			}
757 			qunlock(&row.lk);
758 			free(w);
759     Freecmd:
760 			if(c){
761 				if(c->iseditcmd)
762 					sendul(cedit, 0);
763 				free(c->text);
764 				free(c->name);
765 				fsysdelid(c->md);
766 				free(c);
767 			}
768 			break;
769 		case WCmd:
770 			/* has this command already exited? */
771 			lastp = nil;
772 			for(p=pids; p!=nil; p=p->next){
773 				if(p->pid == c->pid){
774 					if(p->msg[0])
775 						warning(c->md, "%s\n", p->msg);
776 					if(lastp == nil)
777 						pids = p->next;
778 					else
779 						lastp->next = p->next;
780 					free(p);
781 					goto Freecmd;
782 				}
783 				lastp = p;
784 			}
785 			c->next = command;
786 			command = c;
787 			qlock(&row.lk);
788 			t = &row.tag;
789 			textcommit(t, TRUE);
790 			textinsert(t, 0, c->name, c->nname, TRUE);
791 			textsetselect(t, 0, 0);
792 			flushimage(display, 1);
793 			qunlock(&row.lk);
794 			break;
795 		}
796 	}
797 }
798 
799 void
800 xfidallocthread(void *v)
801 {
802 	Xfid *xfree, *x;
803 	enum { Alloc, Free, N };
804 	static Alt alts[N+1];
805 
806 	USED(v);
807 	threadsetname("xfidallocthread");
808 	alts[Alloc].c = cxfidalloc;
809 	alts[Alloc].v = nil;
810 	alts[Alloc].op = CHANRCV;
811 	alts[Free].c = cxfidfree;
812 	alts[Free].v = &x;
813 	alts[Free].op = CHANRCV;
814 	alts[N].op = CHANEND;
815 
816 	xfree = nil;
817 	for(;;){
818 		switch(alt(alts)){
819 		case Alloc:
820 			x = xfree;
821 			if(x)
822 				xfree = x->next;
823 			else{
824 				x = emalloc(sizeof(Xfid));
825 				x->c = chancreate(sizeof(void(*)(Xfid*)), 0);
826 				chansetname(x->c, "xc%p", x->c);
827 				x->arg = x;
828 				threadcreate(xfidctl, x->arg, STACK);
829 			}
830 			sendp(cxfidalloc, x);
831 			break;
832 		case Free:
833 			x->next = xfree;
834 			xfree = x;
835 			break;
836 		}
837 	}
838 }
839 
840 /* this thread, in the main proc, allows fsysproc to get a window made without doing graphics */
841 void
842 newwindowthread(void *v)
843 {
844 	Window *w;
845 
846 	USED(v);
847 	threadsetname("newwindowthread");
848 
849 	for(;;){
850 		/* only fsysproc is talking to us, so synchronization is trivial */
851 		recvp(cnewwindow);
852 		w = makenewwindow(nil);
853 		winsettag(w);
854 		sendp(cnewwindow, w);
855 	}
856 }
857 
858 Reffont*
859 rfget(int fix, int save, int setfont, char *name)
860 {
861 	Reffont *r;
862 	Font *f;
863 	int i;
864 
865 	r = nil;
866 	if(name == nil){
867 		name = fontnames[fix];
868 		r = reffonts[fix];
869 	}
870 	if(r == nil){
871 		for(i=0; i<nfontcache; i++)
872 			if(strcmp(name, fontcache[i]->f->name) == 0){
873 				r = fontcache[i];
874 				goto Found;
875 			}
876 		f = openfont(display, name);
877 		if(f == nil){
878 			fprint(2, "can't open font file %s: %r\n", name);
879 			warning(nil, "can't open font file %s: %r\n", name);
880 			return nil;
881 		}
882 		r = emalloc(sizeof(Reffont));
883 		r->f = f;
884 		fontcache = erealloc(fontcache, (nfontcache+1)*sizeof(Reffont*));
885 		fontcache[nfontcache++] = r;
886 	}
887     Found:
888 	if(save){
889 		incref(&r->ref);
890 		if(reffonts[fix])
891 			rfclose(reffonts[fix]);
892 		reffonts[fix] = r;
893 		if(fontnames[fix] != name){
894 			free(fontnames[fix]);
895 			fontnames[fix] = estrdup(name);
896 		}
897 	}
898 	if(setfont){
899 		reffont.f = r->f;
900 		incref(&r->ref);
901 		rfclose(reffonts[0]);
902 		font = r->f;
903 		reffonts[0] = r;
904 		incref(&r->ref);
905 		iconinit();
906 	}
907 	incref(&r->ref);
908 	return r;
909 }
910 
911 void
912 rfclose(Reffont *r)
913 {
914 	int i;
915 
916 	if(decref(&r->ref) == 0){
917 		for(i=0; i<nfontcache; i++)
918 			if(r == fontcache[i])
919 				break;
920 		if(i >= nfontcache)
921 			warning(nil, "internal error: can't find font in cache\n");
922 		else{
923 			nfontcache--;
924 			memmove(fontcache+i, fontcache+i+1, (nfontcache-i)*sizeof(Reffont*));
925 		}
926 		freefont(r->f);
927 		free(r);
928 	}
929 }
930 
931 Cursor boxcursor = {
932 	{-7, -7},
933 	{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
934 	 0xFF, 0xFF, 0xF8, 0x1F, 0xF8, 0x1F, 0xF8, 0x1F,
935 	 0xF8, 0x1F, 0xF8, 0x1F, 0xF8, 0x1F, 0xFF, 0xFF,
936 	 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
937 	{0x00, 0x00, 0x7F, 0xFE, 0x7F, 0xFE, 0x7F, 0xFE,
938 	 0x70, 0x0E, 0x70, 0x0E, 0x70, 0x0E, 0x70, 0x0E,
939 	 0x70, 0x0E, 0x70, 0x0E, 0x70, 0x0E, 0x70, 0x0E,
940 	 0x7F, 0xFE, 0x7F, 0xFE, 0x7F, 0xFE, 0x00, 0x00}
941 };
942 
943 void
944 iconinit(void)
945 {
946 	Rectangle r;
947 	Image *tmp;
948 
949 	/* Blue */
950 	tagcols[BACK] = allocimagemix(display, DPalebluegreen, DWhite);
951 	tagcols[HIGH] = allocimage(display, Rect(0,0,1,1), screen->chan, 1, DPalegreygreen);
952 	tagcols[BORD] = allocimage(display, Rect(0,0,1,1), screen->chan, 1, DPurpleblue);
953 	tagcols[TEXT] = display->black;
954 	tagcols[HTEXT] = display->black;
955 
956 	/* Yellow */
957 	textcols[BACK] = allocimagemix(display, DPaleyellow, DWhite);
958 	textcols[HIGH] = allocimage(display, Rect(0,0,1,1), screen->chan, 1, DDarkyellow);
959 	textcols[BORD] = allocimage(display, Rect(0,0,1,1), screen->chan, 1, DYellowgreen);
960 	textcols[TEXT] = display->black;
961 	textcols[HTEXT] = display->black;
962 
963 	if(button){
964 		freeimage(button);
965 		freeimage(modbutton);
966 		freeimage(colbutton);
967 	}
968 
969 	r = Rect(0, 0, Scrollwid+2, font->height+1);
970 	button = allocimage(display, r, screen->chan, 0, DNofill);
971 	draw(button, r, tagcols[BACK], nil, r.min);
972 	r.max.x -= 2;
973 	border(button, r, 2, tagcols[BORD], ZP);
974 
975 	r = button->r;
976 	modbutton = allocimage(display, r, screen->chan, 0, DNofill);
977 	draw(modbutton, r, tagcols[BACK], nil, r.min);
978 	r.max.x -= 2;
979 	border(modbutton, r, 2, tagcols[BORD], ZP);
980 	r = insetrect(r, 2);
981 	tmp = allocimage(display, Rect(0,0,1,1), screen->chan, 1, DMedblue);
982 	draw(modbutton, r, tmp, nil, ZP);
983 	freeimage(tmp);
984 
985 	r = button->r;
986 	colbutton = allocimage(display, r, screen->chan, 0, DPurpleblue);
987 
988 	but2col = allocimage(display, r, screen->chan, 1, 0xAA0000FF);
989 	but3col = allocimage(display, r, screen->chan, 1, 0x006600FF);
990 }
991 
992 /*
993  * /dev/snarf updates when the file is closed, so we must open our own
994  * fd here rather than use snarffd
995  */
996 
997 /* rio truncates larges snarf buffers, so this avoids using the
998  * service if the string is huge */
999 
1000 #define MAXSNARF 100*1024
1001 
1002 void
1003 acmeputsnarf(void)
1004 {
1005 	int i, n;
1006 	Fmt f;
1007 	char *s;
1008 
1009 	if(snarfbuf.nc==0)
1010 		return;
1011 	if(snarfbuf.nc > MAXSNARF)
1012 		return;
1013 
1014 	fmtstrinit(&f);
1015 	for(i=0; i<snarfbuf.nc; i+=n){
1016 		n = snarfbuf.nc-i;
1017 		if(n >= NSnarf)
1018 			n = NSnarf;
1019 		bufread(&snarfbuf, i, snarfrune, n);
1020 		if(fmtprint(&f, "%.*S", n, snarfrune) < 0)
1021 			break;
1022 	}
1023 	s = fmtstrflush(&f);
1024 	if(s && s[0])
1025 		putsnarf(s);
1026 	free(s);
1027 }
1028 
1029 void
1030 acmegetsnarf(void)
1031 {
1032 	char *s;
1033 	int nb, nr, nulls, len;
1034 	Rune *r;
1035 
1036 	s = getsnarf();
1037 	if(s == nil || s[0]==0){
1038 		free(s);
1039 		return;
1040 	}
1041 
1042 	len = strlen(s);
1043 	r = runemalloc(len+1);
1044 	cvttorunes(s, len, r, &nb, &nr, &nulls);
1045 	bufreset(&snarfbuf);
1046 	bufinsert(&snarfbuf, 0, r, nr);
1047 	free(r);
1048 	free(s);
1049 }